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Materials
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Structures, Properties, and Phase Transition in Dielectric Ceramics
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Structures, Properties, and Phase Transition in Dielectric Ceramics

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: 20 June 2025 | Viewed by 2572

Special Issue Editors

Prof. Dr. Xinghua Zheng

E-Mail Website
Guest Editor
Institute of Advanced Ceramics, College of Materials Science and Engineering, Fuzhou University, 2 Xueyuan Road, University Town, Fuzhou 350108, China
Interests: dielectrics; ferroelectrics; phase transition; characterization
Dr. Hao Li

E-Mail Website
Guest Editor
College of Electrical and Information Engineering, Hunan University, 410082, Changsha, China
Interests: microwave/millimeter-wave electronic components; low-temperature co-fired ceramics and integrated devices; dielectric energy storage ceramics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Dielectric ceramics are an important material widely applied in the fields of electronics and energy for capacitive energy storage, electrostriction, electrocaloric cooling, etc. Their structure, phase transition, and dielectric mechanism are crucial to achieving high-performance dielectric ceramics with high breakdown strength, high permittivity, low loss, and a wide operating temperature range. Characterizing structure and phase transition and evaluating its properties are significant to developing dielectric ceramics. In order to promote academic exchanges, Materials plans to launch a Special Issue entitled “Structures, Properties, and Phase Transition in Dielectric Ceramics”. This Special Issue aims to provide a unique international forum for researchers working in dielectric ceramics to report their latest endeavors to advance this field, including new pristine dielectric ceramics, strategies used to improve dielectric properties, dielectric mechanisms, the structures and phase transition of dielectric ceramics, the discovery of new dielectric ceramics, and so on. We will solicit high-level research papers and reviews globally.

Prof. Dr. Xinghua Zheng
Dr. Hao Li
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • phase transition

  • dielectric properties
  • core-shell
  • sintering temperature
  • dielectric mechanism
  • grain growth
  • dielectric relaxation

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Published Papers (2 papers)

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Research

11 pages, 6089 KiB  
Article
Interface-Strengthened Ru-Based Electrocatalyst for High-Efficiency Proton Exchange Membrane Water Electrolysis at Industrial-Level Current Density
by Wenjun Lei, Xinxin Zhao, Chao Liang, Huai Wang, Xuehong Li, Mingkun Jiang, Xiaofeng Li, Fengqin He, Yonghui Sun, Gang Lu and Hairui Cai
Materials 2024, 17(20), 4991; https://doi.org/10.3390/ma17204991 - 12 Oct 2024
Cited by 1 | Viewed by 941
Abstract
Developing an OER electrocatalyst that balances high performance with low cost is crucial for widely adopting PEM water electrolyzers. Ru-based catalysts are gaining attention for their cost-effectiveness and high activity, positioning them as promising alternatives to Ir-based catalysts. However, Ru-based catalysts can be [...] Read more.
Developing an OER electrocatalyst that balances high performance with low cost is crucial for widely adopting PEM water electrolyzers. Ru-based catalysts are gaining attention for their cost-effectiveness and high activity, positioning them as promising alternatives to Ir-based catalysts. However, Ru-based catalysts can be prone to oxidation at high potentials, compromising their durability. In this study, we utilize a simple synthesis method to synthesize a SnO2, Nb2O5, and RuO2 composite catalyst (SnO2/Nb2O5@RuO2) with multiple interfaces and abundant oxygen vacancies. The large surface area and numerous active sites of the SnO2/Nb2O5@RuO2 catalyst lead to outstanding acidic oxygen evolution reaction (OER) performance, achieving current densities of 10, 50, and 200 mA cm−2 at ultralow overpotentials of 287, 359, and 534 mV, respectively, significantly surpassing commercial IrO2. Moreover, incorporating Nb2O5 into the SnO2/Nb2O5@RuO2 alters the electronic structure at the interfaces and generates a high density of oxygen vacancies, markedly enhancing durability. Consequently, the membrane electrode composed of SnO2/Nb2O5@RuO2 and commercial Pt/C demonstrated stable operation in the PEM cell for 25 days at an industrial current density of 1 A cm−2. This research presents a convenient approach for developing a highly efficient and durable Ru-based electrocatalyst, underscoring its potential for proton exchange membrane water electrolysis. Full article
(This article belongs to the Special Issue Structures, Properties, and Phase Transition in Dielectric Ceramics)
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15 pages, 14021 KiB  
Article
Crystal Structure, Infrared Reflection Spectrum, and Improved Microwave Dielectric Characteristics of Ba4Sm28/3Ti18O54 Ceramics via One-Step Reaction Sintering
by Zeping Li, Huajian Zhou, Gang Xiong, Huifeng Wang and Geng Wang
Materials 2024, 17(14), 3477; https://doi.org/10.3390/ma17143477 - 13 Jul 2024
Cited by 1 | Viewed by 1240
Abstract
High-k Ba4Sm28/3Ti18O54 ceramics with improved microwave dielectric characteristics were successfully fabricated using the one-step reaction sintering (RS) route. The sintering characteristics, microstructure, crystal structure, infrared reflection spectrum, and microwave dielectric characteristics of Ba4Sm28/3 [...] Read more.
High-k Ba4Sm28/3Ti18O54 ceramics with improved microwave dielectric characteristics were successfully fabricated using the one-step reaction sintering (RS) route. The sintering characteristics, microstructure, crystal structure, infrared reflection spectrum, and microwave dielectric characteristics of Ba4Sm28/3Ti18O54 ceramics prepared by the RS route were systematically investigated. Samples prepared by the RS route exhibited single-phase orthorhombic tungsten–bronze structure and dense microstructure at optimum sintering temperature. Compared with the conventional solid-state (CS) process, the Ba4Sm28/3Ti18O54 ceramics fabricated by the RS route presented a smaller temperature coefficient (TCF), a higher quality factor (Q × f), and a higher permittivity (εr). The improved microwave dielectric characteristics were highly dependent on the theoretical permittivity, atomic packing fraction, suppression of Ti3+, and Ti-site bond valence. Excellent combined microwave dielectric characteristics (TCF = −7.9 ppm/°C, Q × f = 9519 GHz, εr = 80.26) were achieved for Ba4Sm28/3Ti18O54 ceramics prepared by RS route sintered at 1400 °C, suggesting the RS route was a straightforward, economical and effective route to prepare high-performance Ba4Sm28/3Ti18O54 ceramics with promising application potential. Full article
(This article belongs to the Special Issue Structures, Properties, and Phase Transition in Dielectric Ceramics)
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